diff --git a/cypress/integration/rendering/requirementDiagram-unified.spec.js b/cypress/integration/rendering/requirementDiagram-unified.spec.js
new file mode 100644
index 000000000..48b1a0d61
--- /dev/null
+++ b/cypress/integration/rendering/requirementDiagram-unified.spec.js
@@ -0,0 +1,703 @@
+import { imgSnapshotTest, renderGraph } from '../../helpers/util.ts';
+
+const testOptions = [
+  { description: '', options: { logLevel: 1 } },
+  { description: 'ELK: ', options: { logLevel: 1, layout: 'elk' } },
+  { description: 'HD: ', options: { logLevel: 1, look: 'handDrawn' } },
+];
+
+describe('Requirement Diagram Unified', () => {
+  testOptions.forEach(({ description, options }) => {
+    it(`${description}should render a simple Requirement diagram`, () => {
+      imgSnapshotTest(
+        `
+    requirementDiagram
+        requirement test_req {
+        id: 1
+        text: the test text.
+        risk: high
+        verifymethod: test
+        }
+
+        element test_entity {
+        type: simulation
+        }
+
+        test_entity - satisfies -> test_req
+        `,
+        options
+      );
+    });
+
+    it(`${description}should render a simple Requirement diagram without htmlLabels`, () => {
+      imgSnapshotTest(
+        `
+    requirementDiagram
+        requirement test_req {
+        id: 1
+        text: the test text.
+        risk: high
+        verifymethod: test
+        }
+
+        element test_entity {
+        type: simulation
+        }
+
+        test_entity - satisfies -> test_req
+        `,
+        { ...options, htmlLabels: false }
+      );
+    });
+
+    it(`${description}should render a not-so-simple Requirement diagram`, () => {
+      imgSnapshotTest(
+        `
+    requirementDiagram
+
+        requirement test_req {
+        id: 1
+        text: the test text.
+        risk: high
+        verifymethod: test
+        }
+
+        functionalRequirement test_req2 {
+        id: 1.1
+        text: the second test text.
+        risk: low
+        verifymethod: inspection
+        }
+
+        performanceRequirement test_req3 {
+        id: 1.2
+        text: the third test text.
+        risk: medium
+        verifymethod: demonstration
+        }
+
+        interfaceRequirement test_req4 {
+        id: 1.2.1
+        text: the fourth test text.
+        risk: medium
+        verifymethod: analysis
+        }
+
+        physicalRequirement test_req5 {
+        id: 1.2.2
+        text: the fifth test text.
+        risk: medium
+        verifymethod: analysis
+        }
+
+        designConstraint test_req6 {
+        id: 1.2.3
+        text: the sixth test text.
+        risk: medium
+        verifymethod: analysis
+        }
+
+        element test_entity {
+        type: simulation
+        }
+
+        element test_entity2 {
+        type: word doc
+        docRef: reqs/test_entity
+        }
+
+        element test_entity3 {
+        type: "test suite"
+        docRef: github.com/all_the_tests
+        }
+
+
+        test_entity - satisfies -> test_req2
+        test_req - traces -> test_req2
+        test_req - contains -> test_req3
+        test_req3 - contains -> test_req4
+        test_req4 - derives -> test_req5
+        test_req5 - refines -> test_req6
+        test_entity3 - verifies -> test_req5
+        test_req <- copies - test_entity2
+        `,
+        options
+      );
+    });
+
+    it(`${description}should render a not-so-simple Requirement diagram without htmlLabels`, () => {
+      imgSnapshotTest(
+        `
+    requirementDiagram
+
+        requirement test_req {
+        id: 1
+        text: the test text.
+        risk: high
+        verifymethod: test
+        }
+
+        functionalRequirement test_req2 {
+        id: 1.1
+        text: the second test text.
+        risk: low
+        verifymethod: inspection
+        }
+
+        performanceRequirement test_req3 {
+        id: 1.2
+        text: the third test text.
+        risk: medium
+        verifymethod: demonstration
+        }
+
+        interfaceRequirement test_req4 {
+        id: 1.2.1
+        text: the fourth test text.
+        risk: medium
+        verifymethod: analysis
+        }
+
+        physicalRequirement test_req5 {
+        id: 1.2.2
+        text: the fifth test text.
+        risk: medium
+        verifymethod: analysis
+        }
+
+        designConstraint test_req6 {
+        id: 1.2.3
+        text: the sixth test text.
+        risk: medium
+        verifymethod: analysis
+        }
+
+        element test_entity {
+        type: simulation
+        }
+
+        element test_entity2 {
+        type: word doc
+        docRef: reqs/test_entity
+        }
+
+        element test_entity3 {
+        type: "test suite"
+        docRef: github.com/all_the_tests
+        }
+
+
+        test_entity - satisfies -> test_req2
+        test_req - traces -> test_req2
+        test_req - contains -> test_req3
+        test_req3 - contains -> test_req4
+        test_req4 - derives -> test_req5
+        test_req5 - refines -> test_req6
+        test_entity3 - verifies -> test_req5
+        test_req <- copies - test_entity2
+        `,
+        { ...options, htmlLabels: false }
+      );
+    });
+
+    it(`${description}should render multiple Requirement diagrams`, () => {
+      imgSnapshotTest(
+        [
+          `
+    requirementDiagram
+
+    requirement test_req {
+    id: 1
+    text: the test text.
+    risk: high
+    verifymethod: test
+    }
+
+    element test_entity {
+    type: simulation
+    }
+
+    test_entity - satisfies -> test_req
+    `,
+          `
+    requirementDiagram
+
+    requirement test_req {
+    id: 1
+    text: the test text.
+    risk: high
+    verifymethod: test
+    }
+
+    element test_entity {
+    type: simulation
+    }
+
+    test_entity - satisfies -> test_req
+    `,
+        ],
+        options
+      );
+    });
+
+    it(`${description}should render a Requirement diagram with empty information`, () => {
+      imgSnapshotTest(
+        `
+    requirementDiagram
+        requirement test_req {
+        }
+        element test_entity {
+        }
+        `,
+        options
+      );
+    });
+
+    it(`${description}should render requirements and elements with and without information`, () => {
+      renderGraph(
+        `
+    requirementDiagram
+        requirement test_req {
+            id: 1
+            text: the test text.
+            risk: high
+            verifymethod: test
+        }
+        element test_entity {
+        }
+        `,
+        options
+      );
+    });
+
+    it(`${description}should render requirements and elements with long and short text`, () => {
+      renderGraph(
+        `
+    requirementDiagram
+        requirement test_req {
+            id: 1
+            text: the test text that is long and takes up a lot of space.
+            risk: high
+            verifymethod: test
+        }
+        element test_entity_name_that_is_extra_long {
+        }
+        `,
+        options
+      );
+    });
+
+    it(`${description}should render requirements and elements with long and short text without htmlLabels`, () => {
+      renderGraph(
+        `
+      requirementDiagram
+          requirement test_req {
+              id: 1
+              text: the test text that is long and takes up a lot of space.
+              risk: high
+              verifymethod: test
+          }
+          element test_entity_name_that_is_extra_long {
+          }
+          `,
+        { ...options, htmlLabels: false }
+      );
+    });
+
+    it(`${description}should render requirements and elements with quoted text for spaces`, () => {
+      renderGraph(
+        `
+      requirementDiagram
+          requirement "test req name with spaces" {
+              id: 1
+              text: the test text that is long and takes up a lot of space.
+              risk: high
+              verifymethod: test
+          }
+          element "test entity name that is extra long with spaces" {
+          }
+          `,
+        options
+      );
+    });
+
+    it(`${description}should render requirements and elements with markdown text`, () => {
+      renderGraph(
+        `
+      requirementDiagram
+          requirement "__my bolded name__" {
+              id: 1
+              text: "**Bolded text** _italicized text_"
+              risk: high
+              verifymethod: test
+          }
+          element "*my italicized name*" {
+            type: "**Bolded type** _italicized type_"
+            docref: "*Italicized* __Bolded__"
+          }
+          `,
+        options
+      );
+    });
+
+    it(`${description}should render requirements and elements with markdown text without htmlLabels`, () => {
+      renderGraph(
+        `
+      requirementDiagram
+          requirement "__my bolded name__" {
+              id: 1
+              text: "**Bolded text** _italicized text_"
+              risk: high
+              verifymethod: test
+          }
+          element "*my italicized name*" {
+            type: "**Bolded type** _italicized type_"
+            docref: "*Italicized* __Bolded__"
+          }
+          `,
+        { ...options, htmlLabels: false }
+      );
+    });
+
+    it(`${description}should render a simple Requirement diagram with a title`, () => {
+      imgSnapshotTest(
+        `---
+  title: simple Requirement diagram
+  ---
+    requirementDiagram
+
+    requirement test_req {
+    id: 1
+    text: the test text.
+    risk: high
+    verifymethod: test
+    }
+
+    element test_entity {
+    type: simulation
+    }
+
+    test_entity - satisfies -> test_req
+  `,
+        options
+      );
+    });
+
+    it(`${description}should render a Requirement diagram with TB direction`, () => {
+      imgSnapshotTest(
+        `
+    requirementDiagram
+    direction TB
+
+    requirement test_req {
+    id: 1
+    text: the test text.
+    risk: high
+    verifymethod: test
+    }
+
+    element test_entity {
+    type: simulation
+    }
+
+    test_entity - satisfies -> test_req
+        `,
+        options
+      );
+    });
+
+    it(`${description}should render a Requirement diagram with BT direction`, () => {
+      imgSnapshotTest(
+        `
+      requirementDiagram
+      direction BT
+  
+      requirement test_req {
+      id: 1
+      text: the test text.
+      risk: high
+      verifymethod: test
+      }
+  
+      element test_entity {
+      type: simulation
+      }
+  
+      test_entity - satisfies -> test_req
+          `,
+        options
+      );
+    });
+
+    it(`${description}should render a Requirement diagram with LR direction`, () => {
+      imgSnapshotTest(
+        `
+      requirementDiagram
+      direction LR
+  
+      requirement test_req {
+      id: 1
+      text: the test text.
+      risk: high
+      verifymethod: test
+      }
+  
+      element test_entity {
+      type: simulation
+      }
+  
+      test_entity - satisfies -> test_req
+          `,
+        options
+      );
+    });
+
+    it(`${description}should render a Requirement diagram with RL direction`, () => {
+      imgSnapshotTest(
+        `
+      requirementDiagram
+      direction RL
+  
+      requirement test_req {
+      id: 1
+      text: the test text.
+      risk: high
+      verifymethod: test
+      }
+  
+      element test_entity {
+      type: simulation
+      }
+  
+      test_entity - satisfies -> test_req
+          `,
+        options
+      );
+    });
+
+    it(`${description}should render requirements and elements with styles applied from style statement`, () => {
+      imgSnapshotTest(
+        `
+    requirementDiagram
+
+    requirement test_req {
+    id: 1
+    text: the test text.
+    risk: high
+    verifymethod: test
+    }
+
+    element test_entity {
+    type: simulation
+    }
+
+    test_entity - satisfies -> test_req
+
+    style test_req,test_entity fill:#f9f,stroke:blue, color:grey, font-weight:bold
+        `,
+        options
+      );
+    });
+
+    it(`${description}should render requirements and elements with styles applied from style statement without htmlLabels`, () => {
+      imgSnapshotTest(
+        `
+      requirementDiagram
+  
+      requirement test_req {
+      id: 1
+      text: the test text.
+      risk: high
+      verifymethod: test
+      }
+  
+      element test_entity {
+      type: simulation
+      }
+  
+      test_entity - satisfies -> test_req
+  
+      style test_req,test_entity fill:#f9f,stroke:blue, color:grey, font-weight:bold
+          `,
+        { ...options, htmlLabels: false }
+      );
+    });
+
+    it(`${description}should render requirements and elements with styles applied from class statement`, () => {
+      imgSnapshotTest(
+        `
+requirementDiagram
+  
+      requirement test_req {
+      id: 1
+      text: the test text.
+      risk: high
+      verifymethod: test
+      }
+  
+      element test_entity {
+      type: simulation
+      }
+  
+      test_entity - satisfies -> test_req
+      classDef bold font-weight: bold
+      classDef blue stroke:lightblue, color: #0000FF
+      class test_entity bold
+      class test_req blue, bold
+        `,
+        options
+      );
+    });
+
+    it(`${description}should render requirements and elements with styles applied from class statement without htmlLabels`, () => {
+      imgSnapshotTest(
+        `
+  requirementDiagram
+    
+        requirement test_req {
+        id: 1
+        text: the test text.
+        risk: high
+        verifymethod: test
+        }
+    
+        element test_entity {
+        type: simulation
+        }
+    
+        test_entity - satisfies -> test_req
+        classDef bold font-weight: bold
+        classDef blue stroke:lightblue, color: #0000FF
+        class test_entity bold
+        class test_req blue, bold
+          `,
+        { ...options, htmlLabels: false }
+      );
+    });
+
+    it(`${description}should render requirements and elements with styles applied from classes with shorthand syntax`, () => {
+      imgSnapshotTest(
+        `
+  requirementDiagram
+    
+        requirement test_req:::blue {
+        id: 1
+        text: the test text.
+        risk: high
+        verifymethod: test
+        }
+    
+        element test_entity {
+        type: simulation
+        }
+    
+        test_entity - satisfies -> test_req
+        classDef bold font-weight: bold
+        classDef blue stroke:lightblue, color: #0000FF
+        test_entity:::bold
+          `,
+        options
+      );
+    });
+
+    it(`${description}should render requirements and elements with styles applied from classes with shorthand syntax without htmlLabels`, () => {
+      imgSnapshotTest(
+        `
+  requirementDiagram
+    
+        requirement test_req:::blue {
+        id: 1
+        text: the test text.
+        risk: high
+        verifymethod: test
+        }
+    
+        element test_entity {
+        type: simulation
+        }
+    
+        test_entity - satisfies -> test_req
+        classDef bold font-weight: bold
+        classDef blue stroke:lightblue, color: #0000FF
+        test_entity:::bold
+          `,
+        { ...options, htmlLabels: false }
+      );
+    });
+
+    it(`${description}should render requirements and elements with styles applied from the default class and other styles`, () => {
+      imgSnapshotTest(
+        `
+requirementDiagram
+  
+      requirement test_req:::blue {
+      id: 1
+      text: the test text.
+      risk: high
+      verifymethod: test
+      }
+  
+      element test_entity {
+      type: simulation
+      }
+  
+      test_entity - satisfies -> test_req
+      classDef blue stroke:lightblue, color:blue
+      classDef default fill:pink
+      style test_entity color:green
+        `,
+        options
+      );
+    });
+
+    it(`${description}should render requirements and elements with styles applied from the default class and other styles without htmlLabels`, () => {
+      imgSnapshotTest(
+        `
+  requirementDiagram
+    
+        requirement test_req:::blue {
+        id: 1
+        text: the test text.
+        risk: high
+        verifymethod: test
+        }
+    
+        element test_entity {
+        type: simulation
+        }
+    
+        test_entity - satisfies -> test_req
+        classDef blue stroke:lightblue, color:blue
+        classDef default fill:pink
+        style test_entity color:green
+          `,
+        { ...options, htmlLabels: false }
+      );
+    });
+
+    it(`${description}should render a Requirement diagram with a theme`, () => {
+      imgSnapshotTest(
+        `
+---
+  theme: forest
+---
+  requirementDiagram
+    
+        requirement test_req:::blue {
+        id: 1
+        text: the test text.
+        risk: high
+        verifymethod: test
+        }
+    
+        element test_entity {
+        type: simulation
+        }
+    
+        test_entity - satisfies -> test_req
+          `,
+        options
+      );
+    });
+  });
+});